What's on with Grouping and Grids?

Just migrated from 4.2.0.663 to 4.2.1.744 and find out that Grids with Grouping feature enabled are not loading the Store data unless the grouping are set and then cleared again. At the time of loading, the Grid only loads one empty record from the Store.

Is there something special we need to to to properly initialize the Grids when using Grouping features?